LS1TECH - Camaro and Firebird Forum Discussion

Generation IV Internal Engine 2005-2014 LS2 | LS3 | LS7 | L92 | LS9

GM 5.3 misfire

Thread Tools
 
Search this Thread
 
Old Oct 17, 2019 | 10:07 PM
Share
  #1  
Tyler Dietzenbach's Avatar
Tyler Dietzenbach
Thread Starter
TECH Fanatic
5 Year Member
Liked
Loved
Community Favorite
iTrader: (5)
 
Joined: May 2019
Posts: 1,006
Likes: 133
From: Kentucky
Default GM 5.3 misfire
2010 Chevy Silverado

139K. Was driving down the highway at 60mph. Check engine light started flashing. Pulled over and it was ticking. Shut it off. Towed back home. Comp testing showed 160-180 for all of the cylinders. Can confirm that the valves move with the covers off. Codes are for misfire #4 and low oil pressure. Anyone have any ideas?

apologies if wrong forum...
Reply
0
Old Oct 17, 2019 | 10:13 PM
Share
  #2  
G Atsma's Avatar
G Atsma
TECH Senior Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2016
Posts: 22,298
Likes: 3,619
From: Central Cal.
Default
Which engine? Does it have DOD/AFM?
Did you check the oil? Was it low? Oil filter clogged?
Reply
0
Old Oct 17, 2019 | 10:16 PM
Share
  #3  
Tyler Dietzenbach's Avatar
Tyler Dietzenbach
Thread Starter
TECH Fanatic
5 Year Member
Liked
Loved
Community Favorite
iTrader: (5)
 
Joined: May 2019
Posts: 1,006
Likes: 133
From: Kentucky
Default
Originally Posted by G Atsma
Which engine? Does it have DOD/AFM?
Did you check the oil? Was it low? Oil filter clogged?

Oil level is fine. Have not checked the filter yet. Yes it is an AFM motor. My very first thought was lifter.. but the valves all move fine and the compression testing shows excellent comp on all cyclinders.
Reply
0
Old Oct 17, 2019 | 10:24 PM
Share
  #4  
G Atsma's Avatar
G Atsma
TECH Senior Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2016
Posts: 22,298
Likes: 3,619
From: Central Cal.
Default
The ticking is a sign of low oil pressure. How much pressure shows on the gauge?
Reply
0
Old Oct 17, 2019 | 10:29 PM
Share
  #5  
Tyler Dietzenbach's Avatar
Tyler Dietzenbach
Thread Starter
TECH Fanatic
5 Year Member
Liked
Loved
Community Favorite
iTrader: (5)
 
Joined: May 2019
Posts: 1,006
Likes: 133
From: Kentucky
Default
Originally Posted by G Atsma
The ticking is a sign of low oil pressure. How much pressure shows on the gauge?
It reads in the normal levels that its always read. However, I plan to Hook up a mechanical gauge tomorrow to verify. Would low oil pressure only cause 1 cylinder to misfire?
Reply
0
Old Oct 17, 2019 | 10:36 PM
Share
  #6  
G Atsma's Avatar
G Atsma
TECH Senior Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2016
Posts: 22,298
Likes: 3,619
From: Central Cal.
Default
Originally Posted by Tyler Dietzenbach
It reads in the normal levels that its always read. However, I plan to Hook up a mechanical gauge tomorrow to verify. Would low oil pressure only cause 1 cylinder to misfire?
That would be best.
Not sure, though one of the AFM/DOD lifters might have partially collapsed and cause a miss.
Reply
0
Old Oct 17, 2019 | 10:38 PM
Share
  #7  
Tyler Dietzenbach's Avatar
Tyler Dietzenbach
Thread Starter
TECH Fanatic
5 Year Member
Liked
Loved
Community Favorite
iTrader: (5)
 
Joined: May 2019
Posts: 1,006
Likes: 133
From: Kentucky
Default
Originally Posted by G Atsma
That would be best.
Not sure, though one of the AFM/DOD lifters might have partially collapsed and cause a miss.
Im just learning through research when it comes to engine internals. If I had a partially or fully collapsed lifter wouldnt the compression be down under 100? Full failure under 25?

I really appreciate your ideas.
Reply
0

Trending Topics

Old Oct 17, 2019 | 10:43 PM
Share
  #8  
G Atsma's Avatar
G Atsma
TECH Senior Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2016
Posts: 22,298
Likes: 3,619
From: Central Cal.
Default
Originally Posted by Tyler Dietzenbach
Im just learning through research when it comes to engine internals. If I had a partially or fully collapsed lifter wouldnt the compression be down under 100? Full failure under 25?

I really appreciate your ideas.
Depends. Compression is checked at starting RPM. The valves only need to open a little to get enough air to compress for good compression. And they would still close for the compression stroke. At running speed the PCM would see it as a miss.
Reply
0
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-1

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-2

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-3

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-4

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-5

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-6

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-7

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-8

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-9

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
Old Oct 17, 2019 | 10:48 PM
Share
  #9  
Tyler Dietzenbach's Avatar
Tyler Dietzenbach
Thread Starter
TECH Fanatic
5 Year Member
Liked
Loved
Community Favorite
iTrader: (5)
 
Joined: May 2019
Posts: 1,006
Likes: 133
From: Kentucky
Default
Originally Posted by G Atsma
Depends. Compression is checked at starting RPM. The valves only need to open a little to get enough air to compress for good compression. And they would still close for the compression stroke. At running speed the PCM would see it as a miss.
Ahh okay. I understand. It was super chuggy when I slowed down btw. Forgot about that. My initial thought was, and probably still is, a lifter issue. It's one of the AFM cylinders so I wouldnt be surprised at all.. very disappointed to say the least. Very inconvenient time for this to happen. I've only put 14K on it since last December. Still owe 12K on the loan.
Reply
0
Old Oct 17, 2019 | 10:49 PM
Share
  #10  
Tyler Dietzenbach's Avatar
Tyler Dietzenbach
Thread Starter
TECH Fanatic
5 Year Member
Liked
Loved
Community Favorite
iTrader: (5)
 
Joined: May 2019
Posts: 1,006
Likes: 133
From: Kentucky
Default
And I've never even come close to abusing it. The Z28 is for that. Lol
Reply
0
Old Oct 17, 2019 | 10:51 PM
Share
  #11  
G Atsma's Avatar
G Atsma
TECH Senior Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2016
Posts: 22,298
Likes: 3,619
From: Central Cal.
Default
Originally Posted by Tyler Dietzenbach
And I've never even come close to abusing it. The Z28 is for that. Lol
It can happen to anyone, man.
Reply
0
Old Oct 17, 2019 | 10:54 PM
Share
  #12  
Tyler Dietzenbach's Avatar
Tyler Dietzenbach
Thread Starter
TECH Fanatic
5 Year Member
Liked
Loved
Community Favorite
iTrader: (5)
 
Joined: May 2019
Posts: 1,006
Likes: 133
From: Kentucky
Default
Plan is to get an accurate oil pressure reading with a mech gauge. I'll report back and keep up to date as best I can. Hopefully if its a lifter, I can get 1 in there and trade the damn thing. I'm in no place to have engine problems.
Reply
0
Old Oct 18, 2019 | 07:17 AM
Share
  #13  
cookseyb's Avatar
cookseyb
TECH Resident
 
Joined: Apr 2010
Posts: 926
Likes: 18
From: Central Texas
Default
Oil pump "O" ring failed allowing pump to suck air....
Reply
0
Old Oct 18, 2019 | 07:33 AM
Share
  #14  
Tyler Dietzenbach's Avatar
Tyler Dietzenbach
Thread Starter
TECH Fanatic
5 Year Member
Liked
Loved
Community Favorite
iTrader: (5)
 
Joined: May 2019
Posts: 1,006
Likes: 133
From: Kentucky
Default
Originally Posted by cookseyb
Oil pump "O" ring failed allowing pump to suck air....
This is definitely one of my theories.

Wouldn't the o ring failure cause more than 1 cyclinder to misfire though?
Reply
0
Old Oct 18, 2019 | 11:55 AM
Share
  #15  
G Atsma's Avatar
G Atsma
TECH Senior Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2016
Posts: 22,298
Likes: 3,619
From: Central Cal.
Default
Originally Posted by Tyler Dietzenbach
This is definitely one of my theories.

Wouldn't the o ring failure cause more than 1 cyclinder to misfire though?
Not if only one lifter failed..
Reply
0
Old Oct 18, 2019 | 01:12 PM
Share
  #16  
Tyler Dietzenbach's Avatar
Tyler Dietzenbach
Thread Starter
TECH Fanatic
5 Year Member
Liked
Loved
Community Favorite
iTrader: (5)
 
Joined: May 2019
Posts: 1,006
Likes: 133
From: Kentucky
Default
Originally Posted by G Atsma
Not if only one lifter failed..
Agree
Reply
0
Back to Subforum
Generation IV Internal Engine
View Next Unread
LS2 Vs LQ9 Build ?s




Advanced Search

All times are GMT -5. The time now is 10:22 PM.

story-0
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-1
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-2
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-3
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-4
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-5
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-6
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-7
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-8
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-9
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE